With the Thule Xsporter Pro Aluminum Rack mounted on your truck, you can haul anything you have from your garage or worksite. From surfboards to ladders and everything inbetween the Thule Xsporter Pro Aluminum Truck Rack gives yo the ability to bring what you need with you. Thule Xsporter Pro Shift is made from a sturdy corrosion-resistant aluminum that keeps the system lightweight and easy to manage. Requires no drilling or cutting to mount, has an easy height adjustment, and superior aerodynamics for an efficient a quiet ride. Thule Xsporter Pro Shift features a SecureLock design that keeps it securely locked onto your truck while holding up to 600 lbs of cargo (your specific vehicle's limit may vary). TracRac-track base rails (which will be included if you order the rack with rails option) allows you to shift the rack uprights along the length of your bed to continuously fit the needs of your changing load sizes, which will keep each load transported safely with the appropriate balance and support. | Thule Xsporter Pro Shift w/ TracRac Rails 500010&TRC-21000